def test_reporter_subset(tmpdir, get_fn):
pdb = PDBFile(get_fn('native2.pdb'))
pdb.topology.setUnitCellDimensions([2, 2, 2])
forcefield = ForceField('amber99sbildn.xml', 'amber99_obc.xml')
system = forcefield.createSystem(pdb.topology, nonbondedMethod=CutoffPeriodic,
nonbondedCutoff=1 * nanometers, constraints=HBonds, rigidWater=True)
integrator = LangevinIntegrator(300 * kelvin, 1.0 / picoseconds, 2.0 * femtoseconds)
integrator.setConstraintTolerance(0.00001)
platform = Platform.getPlatformByName('Reference')
simulation = Simulation(pdb.topology, system, integrator, platform)
simulation.context.setPositions(pdb.positions)
simulation.context.setVelocitiesToTemperature(300 * kelvin)
tmpdir = str(tmpdir)
hdf5file = os.path.join(tmpdir, 'traj.h5')
ncfile = os.path.join(tmpdir, 'traj.nc')
dcdfile = os.path.join(tmpdir, 'traj.dcd')
xtcfile = os.path.join(tmpdir, 'traj.xtc')
atomSubset = [0, 1, 2, 4, 5]
reporter = HDF5Reporter(hdf5file, 2, coordinates=True, time=True,
cell=True, potentialEnergy=True, kineticEnergy=True, temperature=True,
velocities=True, atomSubset=atomSubset)
reporter2 = NetCDFReporter(ncfile, 2, coordinates=True, time=True,
cell=True, atomSubset=atomSubset)
reporter3 = DCDReporter(dcdfile, 2, atomSubset=atomSubset)
reporter4 = XTCReporter(xtcfile, 2, atomSubset=atomSubset)
simulation.reporters.append(reporter)
simulation.reporters.append(reporter2)
simulation.reporters.append(reporter3)
simulation.reporters.append(reporter4)
simulation.step(100)
reporter.close()
reporter2.close()
reporter3.close()
reporter4.close()
t = md.load(get_fn('native.pdb'))
t.restrict_atoms(atomSubset)
with HDF5TrajectoryFile(hdf5file) as f:
got = f.read()
eq(got.temperature.shape, (50,))
eq(got.potentialEnergy.shape, (50,))
eq(got.kineticEnergy.shape, (50,))
eq(got.coordinates.shape, (50, len(atomSubset), 3))
eq(got.velocities.shape, (50, len(atomSubset), 3))
eq(got.cell_lengths, 2 * np.ones((50, 3)))
eq(got.cell_angles, 90 * np.ones((50, 3)))
eq(got.time, 0.002 * 2 * (1 + np.arange(50)))
assert f.topology == md.load(get_fn('native.pdb'), atom_indices=atomSubset).topology
with NetCDFTrajectoryFile(ncfile) as f:
xyz, time, cell_lengths, cell_angles = f.read()
eq(cell_lengths, 20 * np.ones((50, 3)))
eq(cell_angles, 90 * np.ones((50, 3)))
eq(time, 0.002 * 2 * (1 + np.arange(50)))
eq(xyz.shape, (50, len(atomSubset), 3))
hdf5_traj = md.load(hdf5file)
dcd_traj = md.load(dcdfile, top=hdf5_traj)
netcdf_traj = md.load(ncfile, top=hdf5_traj)
xtc_traj = md.load(xtcfile, top=hdf5_traj)
# we don't have to convert units here, because md.load already handles that
eq(hdf5_traj.xyz, netcdf_traj.xyz)
eq(hdf5_traj.unitcell_vectors, netcdf_traj.unitcell_vectors)
eq(hdf5_traj.time, netcdf_traj.time)
eq(xtc_traj.time, netcdf_traj.time)
eq(dcd_traj.xyz, hdf5_traj.xyz)
eq(xtc_traj.xyz, hdf5_traj.xyz)
eq(dcd_traj.unitcell_vectors, hdf5_traj.unitcell_vectors)
def test_reporter(tmpdir, get_fn):
pdb = PDBFile(get_fn('native.pdb'))
forcefield = ForceField('amber99sbildn.xml', 'amber99_obc.xml')
# NO PERIODIC BOUNDARY CONDITIONS
system = forcefield.createSystem(pdb.topology, nonbondedMethod=CutoffNonPeriodic,
nonbondedCutoff=1.0 * nanometers, constraints=HBonds, rigidWater=True)
integrator = LangevinIntegrator(300 * kelvin, 1.0 / picoseconds, 2.0 * femtoseconds)
integrator.setConstraintTolerance(0.00001)
platform = Platform.getPlatformByName('Reference')
simulation = Simulation(pdb.topology, system, integrator, platform)
simulation.context.setPositions(pdb.positions)
simulation.context.setVelocitiesToTemperature(300 * kelvin)
tmpdir = str(tmpdir)
hdf5file = os.path.join(tmpdir, 'traj.h5')
ncfile = os.path.join(tmpdir, 'traj.nc')
dcdfile = os.path.join(tmpdir, 'traj.dcd')
xtcfile = os.path.join(tmpdir, 'traj.xtc')
reporter = HDF5Reporter(hdf5file, 2, coordinates=True, time=True,
cell=True, potentialEnergy=True, kineticEnergy=True, temperature=True,
velocities=True)
reporter2 = NetCDFReporter(ncfile, 2, coordinates=True, time=True, cell=True)
reporter3 = DCDReporter(dcdfile, 2)
reporter4 = XTCReporter(xtcfile, 2)
simulation.reporters.append(reporter)
simulation.reporters.append(reporter2)
simulation.reporters.append(reporter3)
simulation.reporters.append(reporter4)
simulation.step(100)
reporter.close()
reporter2.close()
reporter3.close()
reporter4.close()
with HDF5TrajectoryFile(hdf5file) as f:
got = f.read()
eq(got.temperature.shape, (50,))
eq(got.potentialEnergy.shape, (50,))
eq(got.kineticEnergy.shape, (50,))
eq(got.coordinates.shape, (50, 22, 3))
eq(got.velocities.shape, (50, 22, 3))
eq(got.cell_lengths, None)
eq(got.cell_angles, None)
eq(got.time, 0.002 * 2 * (1 + np.arange(50)))
assert f.topology == md.load(get_fn('native.pdb')).top
with NetCDFTrajectoryFile(ncfile) as f:
xyz, time, cell_lengths, cell_angles = f.read()
eq(cell_lengths, None)
eq(cell_angles, None)
eq(time, 0.002 * 2 * (1 + np.arange(50)))
hdf5_traj = md.load(hdf5file)
dcd_traj = md.load(dcdfile, top=get_fn('native.pdb'))
netcdf_traj = md.load(ncfile, top=get_fn('native.pdb'))
xtc_traj = md.load(xtcfile, top=get_fn('native.pdb'))
# we don't have to convert units here, because md.load already
# handles that
assert hdf5_traj.unitcell_vectors is None
eq(hdf5_traj.xyz, netcdf_traj.xyz)
eq(hdf5_traj.unitcell_vectors, netcdf_traj.unitcell_vectors)
eq(hdf5_traj.time, netcdf_traj.time)
eq(xtc_traj.time, netcdf_traj.time)
eq(dcd_traj.xyz, hdf5_traj.xyz)
eq(xtc_traj.xyz, dcd_traj.xyz, decimal=3)
def test_reporter():
tempdir = os.path.join(dir, 'test1')
os.makedirs(tempdir)
pdb = PDBFile(get_fn('native.pdb'))
forcefield = ForceField('amber99sbildn.xml', 'amber99_obc.xml')
# NO PERIODIC BOUNARY CONDITIONS
system = forcefield.createSystem(pdb.topology,
nonbondedMethod=CutoffNonPeriodic,
nonbondedCutoff=1.0 * nanometers,
constraints=HBonds,
rigidWater=True)
integrator = LangevinIntegrator(300 * kelvin, 1.0 / picoseconds,
2.0 * femtoseconds)
integrator.setConstraintTolerance(0.00001)
platform = Platform.getPlatformByName('Reference')
simulation = Simulation(pdb.topology, system, integrator, platform)
simulation.context.setPositions(pdb.positions)
simulation.context.setVelocitiesToTemperature(300 * kelvin)
hdf5file = os.path.join(tempdir, 'traj.h5')
ncfile = os.path.join(tempdir, 'traj.nc')
dcdfile = os.path.join(tempdir, 'traj.dcd')
reporter = HDF5Reporter(hdf5file,
2,
coordinates=True,
time=True,
cell=True,
potentialEnergy=True,
kineticEnergy=True,
temperature=True,
velocities=True)
reporter2 = NetCDFReporter(ncfile,
2,
coordinates=True,
time=True,
cell=True)
reporter3 = DCDReporter(dcdfile, 2)
simulation.reporters.append(reporter)
simulation.reporters.append(reporter2)
simulation.reporters.append(reporter3)
simulation.step(100)
reporter.close()
reporter2.close()
with HDF5TrajectoryFile(hdf5file) as f:
got = f.read()
yield lambda: eq(got.temperature.shape, (50, ))
yield lambda: eq(got.potentialEnergy.shape, (50, ))
yield lambda: eq(got.kineticEnergy.shape, (50, ))
yield lambda: eq(got.coordinates.shape, (50, 22, 3))
yield lambda: eq(got.velocities.shape, (50, 22, 3))
yield lambda: eq(got.cell_lengths, None)
yield lambda: eq(got.cell_angles, None)
yield lambda: eq(got.time, 0.002 * 2 * (1 + np.arange(50)))
yield lambda: f.topology == md.load(get_fn('native.pdb')).top
with NetCDFTrajectoryFile(ncfile) as f:
xyz, time, cell_lengths, cell_angles = f.read()
yield lambda: eq(cell_lengths, None)
yield lambda: eq(cell_angles, None)
yield lambda: eq(time, 0.002 * 2 * (1 + np.arange(50)))
hdf5_traj = md.load(hdf5file)
dcd_traj = md.load(dcdfile, top=get_fn('native.pdb'))
netcdf_traj = md.load(ncfile, top=get_fn('native.pdb'))
# we don't have to convert units here, because md.load already
# handles that
assert hdf5_traj.unitcell_vectors is None
yield lambda: eq(hdf5_traj.xyz, netcdf_traj.xyz)
yield lambda: eq(hdf5_traj.unitcell_vectors, netcdf_traj.unitcell_vectors)
yield lambda: eq(hdf5_traj.time, netcdf_traj.time)
yield lambda: eq(dcd_traj.xyz, hdf5_traj.xyz)
def test_reporter_subset():
tempdir = os.path.join(dir, 'test2')
os.makedirs(tempdir)
pdb = PDBFile(get_fn('native2.pdb'))
pdb.topology.setUnitCellDimensions([2, 2, 2])
forcefield = ForceField('amber99sbildn.xml', 'amber99_obc.xml')
system = forcefield.createSystem(pdb.topology,
nonbondedMethod=CutoffPeriodic,
nonbondedCutoff=1 * nanometers,
constraints=HBonds,
rigidWater=True)
integrator = LangevinIntegrator(300 * kelvin, 1.0 / picoseconds,
2.0 * femtoseconds)
integrator.setConstraintTolerance(0.00001)
platform = Platform.getPlatformByName('Reference')
simulation = Simulation(pdb.topology, system, integrator, platform)
simulation.context.setPositions(pdb.positions)
simulation.context.setVelocitiesToTemperature(300 * kelvin)
hdf5file = os.path.join(tempdir, 'traj.h5')
ncfile = os.path.join(tempdir, 'traj.nc')
dcdfile = os.path.join(tempdir, 'traj.dcd')
atomSubset = [0, 1, 2, 4, 5]
reporter = HDF5Reporter(hdf5file,
2,
coordinates=True,
time=True,
cell=True,
potentialEnergy=True,
kineticEnergy=True,
temperature=True,
velocities=True,
atomSubset=atomSubset)
reporter2 = NetCDFReporter(ncfile,
2,
coordinates=True,
time=True,
cell=True,
atomSubset=atomSubset)
reporter3 = DCDReporter(dcdfile, 2, atomSubset=atomSubset)
simulation.reporters.append(reporter)
simulation.reporters.append(reporter2)
simulation.reporters.append(reporter3)
simulation.step(100)
reporter.close()
reporter2.close()
reporter3.close()
t = md.load(get_fn('native.pdb'))
t.restrict_atoms(atomSubset)
with HDF5TrajectoryFile(hdf5file) as f:
got = f.read()
eq(got.temperature.shape, (50, ))
eq(got.potentialEnergy.shape, (50, ))
eq(got.kineticEnergy.shape, (50, ))
eq(got.coordinates.shape, (50, len(atomSubset), 3))
eq(got.velocities.shape, (50, len(atomSubset), 3))
eq(got.cell_lengths, 2 * np.ones((50, 3)))
eq(got.cell_angles, 90 * np.ones((50, 3)))
eq(got.time, 0.002 * 2 * (1 + np.arange(50)))
assert f.topology == md.load(get_fn('native.pdb'),
atom_indices=atomSubset).topology
with NetCDFTrajectoryFile(ncfile) as f:
xyz, time, cell_lengths, cell_angles = f.read()
eq(cell_lengths, 20 * np.ones((50, 3)))
eq(cell_angles, 90 * np.ones((50, 3)))
eq(time, 0.002 * 2 * (1 + np.arange(50)))
eq(xyz.shape, (50, len(atomSubset), 3))
hdf5_traj = md.load(hdf5file)
dcd_traj = md.load(dcdfile, top=hdf5_traj)
netcdf_traj = md.load(ncfile, top=hdf5_traj)
# we don't have to convert units here, because md.load already handles
# that
eq(hdf5_traj.xyz, netcdf_traj.xyz)
eq(hdf5_traj.unitcell_vectors, netcdf_traj.unitcell_vectors)
eq(hdf5_traj.time, netcdf_traj.time)
eq(dcd_traj.xyz, hdf5_traj.xyz)
eq(dcd_traj.unitcell_vectors, hdf5_traj.unitcell_vectors)
def topology_batched_md(num=-1, batch_size=16, step_size=100, ani_path='.'):
gs = []
import dgl
from dgl import data
ofs = oechem.oemolostream()
idx = 0
for path in os.listdir(ani_path):
if idx > num and num != -1:
break
if path.endswith('.h5'):
f = h5py.File(path, 'r')
for d0 in list(f.keys()):
if idx > num and num != -1:
break
for d1 in list(f[d0].keys()):
if idx > num and num != -1:
break
print(idx)
try:
smiles = ''.join([
x.decode('utf-8')
for x in f[d0][d1]['smiles'].value.tolist()
])
coordinates = f[d0][d1]['coordinates'].value
energies = f[d0][d1]['energies'].value
species = [
x.decode('utf-8')
for x in f[d0][d1]['species'].value
]
low_energy_idx = np.argsort(energies)[0]
g, mol = get_ani_mol(coordinates[low_energy_idx],
species, smiles)
ofs.open('ds_md/' + str(idx) + '.sdf')
oechem.OEWriteMolecule(ofs, mol)
# g = hgfp.graph.from_oemol(mol)
# g = hgfp.data.mm_energy.u(mol, toolkit='openeye', return_graph=True)
mol = Molecule.from_openeye(mol)
topology = Topology.from_molecules(mol)
mol_sys = FF.create_openmm_system(topology)
integrator = LangevinIntegrator(
500 * kelvin, 1 / picosecond, 0.002 * picoseconds)
simulation = Simulation(topology.to_openmm(), mol_sys,
integrator)
simulation.context.setPositions(0.1 *
g.ndata['xyz'].numpy())
simulation.reporters.append(
DCDReporter('ds_md/' + str(idx) + '.dcd', 10))
simulation.minimizeEnergy()
simulation.step(10000)
idx += 1
except:
continue
ligand_atoms = md_topology.select(selection)
r_parallel = openmm.CustomCentroidBondForce(3, '0')
r_parallel.addGroup([int(index) for index in ligand_atoms])
r_parallel.addGroup([int(index) for index in bottom_atoms], [1.0, 1.0, 1.0])
r_parallel.addGroup([int(index) for index in top_atoms], [1.0, 1.0, 1.0])
r_parallel.addBond([0, 1, 2], [])
bv = mtd.BiasVariable(r_parallel_bias, -2.0, 3.0, 0.1, False)
integrator = openmm.LangevinIntegrator(temperature, collision_rate, timestep)
meta = mtd.Metadynamics(
openmm_system, [bv],
r_parallel,
temperature,
10,
5 * unit.kilojoules_per_mole,
1000,
saveFrequency=20000,
biasDir='/data/chodera/silveira/OprD/gromacs/metadynamics/')
simulation = app.Simulation(pdb.topology, openmm_system, integrator)
simulation.context.setPositions(pdb.positions)
analysis_particle_indices = md_topology.select(
'(protein and mass > 3.0) or (resname CM7 and mass > 3.0)')
mdtraj_reporter = DCDReporter('trajectory.dcd',
50000,
atomSubset=analysis_particle_indices)
simulation.reporters.append(mdtraj_reporter)
meta.step(simulation, 75000000)
def distributeAtoms(boxsize=[34, 34, 34],
nparticles=1000,
reduced_density=0.05,
mass=39.9 * unit.amu, # argon
sigma=3.4 * unit.angstrom, # argon,
epsilon=0.238 * unit.kilocalories_per_mole, # argon,
cutoff=None,
switch_width=3.4 * unit.angstrom, # argon
dispersion_correction=True,
lattice=False,
charge=None,
**kwargs):
# Determine Lennard-Jones cutoff.
if cutoff is None:
cutoff = 3.0 * sigma
charge = 0.0 * unit.elementary_charge
cutoff_type = openmm.NonbondedForce.CutoffPeriodic
# Create an empty system object.
system = openmm.System()
# Periodic box vectors.
a = unit.Quantity((boxsize[0] * unit.angstrom, 0 * unit.angstrom, 0 * unit.angstrom))
b = unit.Quantity((0 * unit.angstrom, boxsize[1] * unit.angstrom, 0 * unit.angstrom))
c = unit.Quantity((0 * unit.angstrom, 0 * unit.angstrom, boxsize[2] * unit.angstrom))
system.setDefaultPeriodicBoxVectors(a, b, c)
# Set up periodic nonbonded interactions with a cutoff.
nb = openmm.NonbondedForce()
nb.setNonbondedMethod(cutoff_type)
nb.setCutoffDistance(cutoff)
nb.setUseDispersionCorrection(dispersion_correction)
nb.setUseSwitchingFunction(False)
if (switch_width is not None):
nb.setUseSwitchingFunction(True)
nb.setSwitchingDistance(cutoff - switch_width)
for particle_index in range(nparticles):
system.addParticle(mass)
nb.addParticle(charge, sigma, epsilon)
positions = subrandom_particle_positions(nparticles, system.getDefaultPeriodicBoxVectors(), 2)
# Add the nonbonded force.
system.addForce(nb)
# Add a restrining potential to keep atoms in z=0
energy_expression = 'k * (z^2)'
force = openmm.CustomExternalForce(energy_expression)
force.addGlobalParameter('k', 100)
for particle_index in range(nparticles):
force.addParticle(particle_index, [])
system.addForce(force)
# Create topology.
topology = app.Topology()
element = app.Element.getBySymbol('Ar')
chain = topology.addChain()
for particle in range(system.getNumParticles()):
residue = topology.addResidue('Ar', chain)
topology.addAtom('Ar', element, residue)
topology.setUnitCellDimensions(unit.Quantity(boxsize, unit.angstrom))
# Simulate it
from simtk.openmm import LangevinIntegrator, VerletIntegrator
from simtk.openmm.app import Simulation, PDBReporter, StateDataReporter, PDBFile
from simtk.unit import kelvin, picoseconds, picosecond, angstrom
from sys import stdout
from mdtraj.reporters import DCDReporter
#from dcdreporter import DCDReporter
nsteps = 10000
freq = 1
#integrator = LangevinIntegrator(300 * kelvin, 1 / picosecond, 0.002 * picoseconds)
integrator = VerletIntegrator(0.002 * picoseconds)
simulation = Simulation(topology, system, integrator)
simulation.context.setPositions(positions)
simulation.minimizeEnergy()
simulation.reporters.append(DCDReporter('output.dcd', 1))
simulation.reporters.append(StateDataReporter(stdout, 1000, potentialEnergy=True, totalEnergy=True, step=True, separator=' '))
simulation.step(nsteps)
state = simulation.context.getState(getPositions=True)
finalpos = state.getPositions(asNumpy=True).value_in_unit(angstrom)
with open('topology.pdb', 'w') as f:
PDBFile.writeFile(topology, positions, f)
from htmd.molecule.molecule import Molecule
mol = Molecule('topology.pdb')
mol.read('output.dcd')
return finalpos, mol, system, simulation
